156 TAPEWORMS OF BARES AND RABBITS STILES. 



1881, Tcenia rhopalocephala, EIEHM, Zeitschr. f. d. ges. Naturwiss., 3 ser., VI, p. 200; 



551-562, pi. v, iigs. 1, 7-10, 18, vi, 1. 

 1891, Anoplocepliala rkopalocephala (RiEHM, 1881), R. BLAXCIIARD. Me"m. Soc. zool. 



France, IV, p. 448. 

 1893, Andrya pectinata ([GoEZE, 1782] ZEDER. 1800), RAILLIET, Traite" de Zool. m6d. et 



agric., I, p. 283. 

 1895, Andyra rhopalocephctla (RiEiiM, 1881), STILES, Vet. Mag., II, pp. 343, 344. 



I can find no evidence that Goeze (1782) had any single-pored forms 

 before him when he described his Tcenia pectinata. Zeder l in 1800 rede- 

 scribed what he supposed was Goeze's species, but states that the pores 

 were single. Eiehm 2 in 1881 considered Zeder's species identical with 

 the one now under consideration, and authors have followed him in 

 this opinion. Zeder's description appears to me, however, altogether 

 too fragmentary to accept this view as proven ; at the same time it is 

 impossible to definitely disprove Eiehm's conclusion. Eiehm 3 in 1881 

 was the first to recognize Tcenia rhopalocephala as a distinct form $ his 

 revised diagnosis 4 reads as follows : 



Kopf hakenlos, gross und keulenformig, mit stark vorspringenden, machtigen 

 Saugnapfen, scharf abgesetzt gegen den Halstheil. GeschL cktsoffnungen einfach im 

 unteren Viertheil des Proglottidenrandes gelegen, meist durchgiingig auf derselben 

 Seite. Glieder trapezforimg, etwa eben so breit als lang. La'nge im ausgestreckten 

 Zustande 6080 cm., Breite der reifsten Glieder wenig iiber 5 mm. Wohnthier: 

 Lepus timidus. 



Blanchard 5 in 1891 transferred Eiehm's species to the genus Anoplo- 

 cephala, while Eailliet 6 in 1893 took it as type of the genus Andrya. 

 Eailliet reverted to Zeder's specific name, but I now adopt rhopalo- 

 cephala on the ground that Zeder's pectinata was not proposed as a name 

 for a new species, but Zeder was under the impression that he was 

 redescribing Goeze's form. Andrya rlwpalocepliala has not yet been 

 recorded for this country. The following statements are based upon 

 Eiehm's specimen (No. 1484, U.S.N.M.), mentioned on p. 155. 



The anlage of the genital canals and female glands appears earlier 

 than the testicles. In the lateral third of the segment on the pore 

 side the undifferentiated anlage of the canals may be distinguished 

 in the distal portion of the segment, and at its median end it becomes 

 widened to form the anlage of the female glands. The anlage of the 

 canals gradually thickens while the portion destined to form the female 

 glands becomes more 01* less distinctly separated from it. At a time 

 when this apparent separation takes place, small, quite indistinct, 

 points of chromatophile material appear in the aporose portion of the 

 median field and form the anlagen of the testicles. The segment now 



J Erster Nachtrag zur Natur. der Eingew., Leipzig, pp. 246-249. 

 2 Stud. an Cestoden, Zeit. ges. Nat., 3 ser., VI, pp. 545-546, pi. v-vi. 

 3 [Untersuchungen an den Bandwiirmern der Hasen und Kaninchen], Zeitschr. ges. 

 Naturw., 3 ser., VI, p. 200. 



4 Studien an Cestodeo, Zeitschr. ges. Naturw., 3 ser., VI, p. 551. 



6 Mem. Soc. zool. France, IV, p. 448. 



6 Traite de Zool. me"d. et agric., I, p. 283. 



